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                <p>让程序更强壮的方法<br>作用域安全的构造函数<br>22.1.3 惰性载入函数适用于有多个if判断时，即使只有一个 if 语句的代码，也肯定要比没有 if 语句的慢，所以如果 if 语 句不必每次执行，那么代码可以运行地更快一些。解决方案就是称之为惰性载入的技巧。 惰性载入表示函数执行的分支仅会发生一次。<br>22.3.1 重复的定时器<br>因为senInterval定时器里面的程序执行也需要时间，所以可能不会严格按照设定的时间执行，有缺点，<br>为了避免 setInterval()的重复定时器的这 缺点，你可以用如下模式使用链式 setTimeout() 调用。<br>setTimeout(function(){ //处理中<br>    setTimeout(arguments.callee, interval);<br>}, interval);</p>
<p>   var a = setTimeout(function () { //处理中<br>        console.log(111)<br>        setTimeout(arguments.callee, 1000);<br>    }, 1000);<br>   document.getElementById(‘my-btn’).onclick=function (ev) {<br>       clearTimeout(a)<br>无法通过这种方式停止定时器<br>   }</p>
<p> setTimeout(function(){<br>        var div = document.getElementById(“myDiv”);<br>        left = parseInt(div.style.left) + 5;<br>        div.style.left = left + “px”;<br>可以通过这种加条件的方式停止定时器<br>        if (left &lt; 200){<br>        setTimeout(arguments.callee, 50);<br>   } }, 50);<br>数组分块<br>22.3.3 函数节流<br>css设置两个盒子宽50%却掉落下来，设置了width: 50%;display: inline-block;<br>原因：两个盒子之间存在空白节点，删掉就在一行了，或者设置父盒子 font-size: 0;子盒子随便设置 font-size: </p>
<p>观察者模式</p>


                
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